Spencer Grammer: My Due Date Is Saturday!

Kelsey Grammer is getting excited about the latest role he’s about to take on: grandfather.

The actor’s expectant daughter, Spencer Grammer, is due with a baby boy on Saturday – although she notes that she’s expecting a late arrival – and she says her dad is eagerly awaiting the new addition.

“I mean, he loves babies,” the Greek star, 27, told PEOPLE Thursday in Los Angeles at a screening of her father’s new show, Boss.